Whale Watching, Cabo San Lucas
On the main square you will find a skeleton of a grey whale in front of a museum. I guess it is a part of the museum. We tried two times to visit the museum, but every time we went it was closed. Not that we were to late, but the guards went to (2 > 3 hours) early at home. Not an interesting place for tourists it seems...
Whale watching is a hit-or-miss activity in Cabo. Humpback whales from the north live in the waters off Cabo from November to March, and it is a spectacular sight if you get to see one jump out of the water as I did. There are many companies offering whale watching tours. You should be able to get a tour for about US$40, but make reservations.
Cabo is a prime spot for whale watching during the winter months. Whales travel from the polar waters around Alaska to mate and calf here in the winter months.